阅读说明：本技术 热泵机组的室外机、热泵机组及其送风方法 (Outdoor unit of heat pump unit, heat pump unit and air supply method of heat pump unit ) 是由 刘景升 刘江彬 任滔 柴婷 李银银 孟庆良 阚荣强 裴梦宇 侯郡阳 于 2021-01-05 设计创作，主要内容包括：本发明涉及热泵技术领域,具体提供了一种热泵机组的室外机、热泵机组及其送风方法,旨在改善热泵机组的蒸发冷换热器的换热效率。室外机的风冷风道环绕蒸发冷主风道,蒸发冷连通风道用于将室外空气导入蒸发冷主风道内,辅助送风结构用于允许或阻止风冷风道内空气进入蒸发冷主风道内,并且风冷风道内设置有风冷换热器,蒸发冷主风道内设置有蒸发冷换热器。制冷时,辅助送风结构阻止风冷风道内空气流向蒸发冷主风道,提高了蒸发冷主风道内的风速,改善了蒸发冷换热器的换热效果,提高了其制冷量；制热时,辅助送风结构允许风冷风道内空气流向蒸发冷风道,增大了蒸发冷主风道内的风量,改善了蒸发冷换热器的换热效果,提高了其制热量。(The invention relates to the technical field of heat pumps, and particularly provides an outdoor unit of a heat pump unit, the heat pump unit and an air supply method thereof, aiming at improving the heat exchange efficiency of an evaporative cooling heat exchanger of the heat pump unit. The air cooling air channel of the outdoor unit surrounds the main evaporating air channel, the evaporating air channel is used for guiding outdoor air into the main evaporating air channel, the auxiliary air supply structure is used for allowing or preventing air in the air cooling air channel from entering the main evaporating air channel, the air cooling air channel is internally provided with an air cooling heat exchanger, and the main evaporating air channel is internally provided with an evaporating air cooling heat exchanger. During refrigeration, the auxiliary air supply structure prevents air in the air cooling air channel from flowing to the evaporation cooling main air channel, so that the air speed in the evaporation cooling main air channel is improved, the heat exchange effect of the evaporation cooling heat exchanger is improved, and the refrigerating capacity of the evaporation cooling heat exchanger is improved; when heating, the auxiliary air supply structure allows air in the air cooling air channel to flow to the evaporation cooling air channel, so that the air quantity in the evaporation cooling main air channel is increased, the heat exchange effect of the evaporation cooling heat exchanger is improved, and the heating quantity of the evaporation cooling heat exchanger is improved.)

1. The outdoor unit of the heat pump unit is characterized by comprising an air cooling air channel, an evaporation cooling main air channel, an evaporation cooling connecting air channel and an auxiliary air supply structure, wherein the air cooling air channel surrounds the evaporation cooling main air channel, the evaporation cooling connecting air channel penetrates through the air cooling air channel and is communicated with the evaporation cooling main air channel, the evaporation cooling connecting air channel is used for leading outdoor air into the evaporation cooling main air channel, the auxiliary air supply structure is arranged between the air cooling air channel and the evaporation cooling air channel, the auxiliary air supply structure is used for allowing or preventing air in the air cooling air channel from entering the evaporation cooling main air channel, an air cooling heat exchanger is arranged in the air cooling air channel, and an evaporation cooling heat exchanger is arranged in the evaporation cooling main air channel.

2. The outdoor unit of claim 1, wherein the outdoor unit comprises an outer casing and an inner casing, the outer casing defines an air-cooling inlet and a main outlet, the inner casing is disposed in the outer casing, and a space defined by an inner wall of the outer casing and an outer wall of the inner casing, and the air-cooling inlet and the main outlet form the air-cooling duct.

3. The outdoor unit of claim 2, further comprising a blast pipe, wherein the outer casing further defines an outer evaporation cold air inlet, the inner casing defines an inner evaporation cold air inlet, and the blast pipe is communicated with the outer evaporation cold air inlet and the inner evaporation cold air inlet to form the evaporation cold air connecting duct.

4. The outdoor unit of claim 3, wherein the inner casing further defines an evaporation cooling outlet, and the inner casing, the inner evaporation cooling inlet and the evaporation cooling outlet form the main evaporation cooling air duct.

5. The outdoor unit of any one of claims 2 to 4, wherein the auxiliary air supply structure comprises at least one auxiliary air inlet, a wind screen and a driving mechanism, the auxiliary air inlet is formed in the inner casing, the wind screen is movably disposed on the inner casing, and the driving mechanism is configured to drive the wind screen to move relative to the inner casing so as to open or close the auxiliary air inlet.

6. The outdoor unit of claim 5, wherein the auxiliary air inlet is formed at each of the inner rear panel, the inner left side panel and the inner right side panel of the inner casing.

7. A heat pump unit characterized in that the heat pump unit comprises an outdoor unit according to any one of claims 1 to 6.

8. An air supply method suitable for the heat pump unit of claim 7, characterized in that the air supply method comprises the following steps:

determining the working mode of the heat pump unit, wherein the working mode comprises refrigeration and heating;

and according to the working mode of the heat pump unit, the auxiliary air supply structure selectively allows or prevents air in the air cooling air channel from entering the main evaporation cooling air channel.

9. The air supply method according to claim 8, wherein selectively allowing or preventing air in the air-cooling duct from entering the main evaporative-cooling duct through the auxiliary air supply structure according to an operation mode of the heat pump unit comprises the following steps:

and when the heat pump unit is determined to refrigerate, the auxiliary air supply structure prevents air in the air cooling air channel from entering the main evaporation cooling air channel.

10. The air supply method according to claim 8, wherein selectively allowing or preventing air in the air-cooling duct from entering the main evaporative-cooling duct through the auxiliary air supply structure according to an operation mode of the heat pump unit comprises the following steps:

and when the heat pump unit is determined to heat, allowing air in the air cooling air channel to enter the main evaporation cooling air channel through the auxiliary air supply structure.

Technical Field

The invention belongs to the technical field of heat pump units, and particularly provides an outdoor unit of a heat pump unit, the heat pump unit and an air supply method thereof.

Background

The heat pump unit at least comprises a compressor, an outdoor heat exchanger, a throttling element and an indoor heat exchanger. The compressor, the outdoor heat exchanger, the throttling element and the indoor heat exchanger are communicated through pipelines to form a refrigerant circulation loop for refrigerant to flow circularly. The outdoor heat exchanger and the indoor heat exchanger may be used as a condenser or an evaporator. When the heat pump unit is used for refrigerating, the outdoor heat exchanger serves as a condenser, and the indoor heat exchanger serves as an evaporator; when the heat pump unit heats, the outdoor heat exchanger serves as an evaporator, and the indoor heat exchanger serves as a condenser.

The working principle of the heat pump unit is as follows: the high-temperature high-pressure gaseous refrigerant compressed by the compressor flows in the refrigerant circulation loop in a circulating manner, is subjected to heat exchange with air in the space where the condenser is located to release heat and condense when flowing through the condenser to form a liquid refrigerant, flows into the evaporator after being throttled by the throttling element, is subjected to heat exchange with the air in the space where the evaporator is located to absorb heat and evaporate the heat to form the gaseous refrigerant, and finally returns to the compressor.

The condenser uses cooling medium water and air to cool and condense the refrigerant, and mainly comprises a water cooling type, an air cooling type and an evaporation cooling type. The air-cooled condenser directly exchanges sensible heat between air and a refrigerant, so that the system has high operation pressure and poor effect in high-temperature weather conditions; the water-cooled condenser exchanges heat with the refrigerant by using cooling water, so that the attenuation is fast, the efficiency is not high, and the water resource waste is serious; the evaporative condenser exchanges heat with a refrigerant by air and water simultaneously, has good heat exchange effect compared with an air-cooled type heat exchange system and a water-cooled type heat exchange system, but also has the problems of poor heat exchange effect in high-temperature weather, water resource waste and reduced heat exchange efficiency after long-time operation.

To this end, the chinese utility model patent (CN208901669U) discloses an evaporation heat pump unit, which essentially discloses an air-cooled evaporation heat pump unit, which is described in paragraphs [ 0167 ] to [ 0170 ] of the specification and accompanying fig. 11 to 16, and comprises an outdoor unit housing, and an air-cooled heat exchanger 42 and an evaporation heat exchanger 43 located in the outdoor unit housing, wherein the air-cooled heat exchanger 42 has a U-shaped structure, openings of the two sets of air-cooled heat exchangers 42 are oppositely disposed, and the evaporation heat exchanger 43 is located in a space surrounded by the two sets of air-cooled heat exchangers 42. The outdoor unit casing has a perforated plate 51. The orifice plate 51 is provided to facilitate the inflow of the external air into the outdoor unit casing.

When the unit is in a winter heating mode, the air-cooled heat exchanger 42 is used as a main evaporation heat exchanger, the evaporation-cooled heat exchanger 43 is used as an auxiliary evaporation heat exchanger, the spraying assembly is closed, and the evaporation-cooled heat exchanger 43 is used as an auxiliary evaporator to absorb air heat, so that the evaporation-cooled unit realizes a heat pump function. When the unit is in a summer refrigeration mode, the spraying assembly is opened, and the condensation effect is improved through the joint operation of the air-cooled heat exchanger 42 and the evaporative cooling heat exchanger 43.

Because the air inlet of the unit is arranged on the side plate of the outdoor unit housing, the air outlet is arranged on the outer top plate of the outdoor unit housing, the two air-cooled heat exchangers surround the evaporative cooling heat exchanger, the air-cooled heat exchanger and the evaporative cooling heat exchanger share one air duct, and outdoor air firstly exchanges heat with the air-cooled heat exchanger and then exchanges heat with the evaporative cooling heat exchanger after entering the air duct. When the heat pump unit heats, the spraying mechanism of the evaporation cold heat exchanger does not work, a refrigerant in the evaporation cold heat exchanger only exchanges heat with the air heat exchanger, and partial outdoor air is directly discharged out of the outdoor unit after the heat exchange of the air cold heat exchanger and does not participate in the heat exchange of the evaporation cold heat exchanger, so that the air quantity entering the evaporation cold heat exchanger is less, and the heating efficiency is low. In addition, when the heat pump unit is used for refrigerating, the spraying mechanism of the evaporative cooling heat exchanger works, outdoor air firstly exchanges heat with the air-cooled heat exchanger to absorb heat and raise temperature and then enters the evaporative cooling heat exchanger, so that the temperature difference between a refrigerant in the evaporative cooling heat exchanger and the outdoor air exchanged with the refrigerant is small, and the problem of low refrigerating efficiency of the evaporative cooling heat exchanger can be caused.

In view of the above, those skilled in the art need to improve the heat exchange efficiency of the evaporative cooling heat exchanger of such a heat pump unit.

Disclosure of Invention

In order to improve the heat exchange efficiency of an evaporative cooling heat exchanger of the conventional heat pump unit, the invention provides an outdoor unit of the heat pump unit.

The outdoor unit of the heat pump unit comprises an air cooling air channel, an evaporation cooling main air channel, an evaporation cooling continuous air channel and an auxiliary air supply structure, wherein the air cooling air channel surrounds the evaporation cooling main air channel, the evaporation cooling continuous air channel penetrates through the air cooling air channel and is communicated with the evaporation cooling main air channel, the evaporation cooling continuous air channel is used for guiding outdoor air into the evaporation cooling main air channel, the auxiliary air supply structure is arranged between the air cooling air channel and the evaporation cooling air channel, the auxiliary air supply structure is used for allowing or preventing air in the air cooling air channel from entering the evaporation cooling main air channel, an air cooling heat exchanger is arranged in the air cooling air channel, and an evaporation cooling heat exchanger is arranged in the evaporation cooling main air channel.

In a preferred embodiment of the outdoor unit of the present invention, the outdoor unit includes an outer casing and an inner casing, the outer casing is provided with an air-cooling air inlet and a main air outlet, the inner casing is disposed in the outer casing, and a space formed by enclosing an inner side wall of the outer casing and an outer side wall of the inner casing, the air-cooling air inlet and the main air outlet, forms the air-cooling air duct.

In a preferred embodiment of the outdoor unit of the present invention, the outdoor unit further includes an air supply pipe, the outer casing is further provided with an outer evaporation cold air inlet, the inner casing is provided with an inner evaporation cold air inlet, and the air supply pipe is communicated with the outer evaporation cold air inlet and the inner evaporation cold air inlet to form the evaporation cold air duct.

In a preferred embodiment of the outdoor unit of the present invention, the auxiliary air supply structure includes at least one auxiliary air inlet, a wind screen and a driving mechanism, the auxiliary air inlet is disposed on the inner casing, the wind screen is movably disposed on the inner casing, and the driving mechanism is configured to drive the wind screen to move relative to the inner casing so as to open or close the auxiliary air inlet.

In a preferred embodiment of the outdoor unit of the present invention, the inner rear panel, the inner left side panel and the inner right side panel of the inner casing are all provided with the auxiliary air inlet.

The outdoor unit of the heat pump unit comprises an air cooling air channel, an evaporation cooling main air channel, an evaporation cooling continuous air channel and an auxiliary air supply structure, wherein the air cooling air channel surrounds the evaporation cooling main air channel, the evaporation cooling continuous air channel penetrates through the air cooling air channel and is communicated with the evaporation cooling main air channel, the evaporation cooling continuous air channel is used for guiding outdoor air into the evaporation cooling main air channel, the auxiliary air supply structure is arranged between the air cooling air channel and the evaporation cooling air channel, the auxiliary air supply structure is used for allowing or preventing air in the air cooling air channel from entering the evaporation cooling main air channel, an air cooling heat exchanger is arranged in the air cooling air channel, and an evaporation cooling heat exchanger is arranged in the evaporation cooling main air channel.

When the heat pump unit refrigerates, the auxiliary air supply structure prevents air in an air cooling air channel where the air cooling heat exchanger is located from flowing to an evaporation cooling main air channel where the evaporation cooling heat exchanger is located, at the moment, the two air channels are completely isolated, and air is independently supplied to the air cooling heat exchanger and the evaporation cooling heat exchanger, so that outdoor air enters the evaporation cooling air channel at a high air speed, a large temperature difference between the outdoor air and a refrigerant is ensured, the heat exchange effect of the evaporation cooling heat exchanger is improved, and the condensation effect of the evaporation cooling heat exchanger is better.

When the heat pump unit heats, the auxiliary air supply structure allows air in an air channel where the air-cooled heat exchanger is located to flow to an air channel where the evaporative cooling heat exchanger is located, outdoor air led in from the evaporative cooling air channel and the air-cooled air channel exist in the evaporative cooling main air channel, the air quantity entering the evaporative cooling air channel is increased, the heat exchange effect of the evaporative cooling heat exchanger is improved, and the heating capacity of the evaporative cooling heat exchanger is improved.

In another aspect, the present invention provides a heat pump unit, which includes the outdoor unit as described above.

In another aspect, the present invention further provides an air supply method suitable for the heat pump unit, where the air supply method includes the following steps: determining the working mode of the heat pump unit, wherein the working mode comprises refrigeration and heating; and according to the working mode of the heat pump unit, the air in the air cooling air channel is selectively allowed or prevented from entering the evaporation cooling main air channel through the auxiliary air supply structure.

In a preferable embodiment of the above air supply method of the present invention, "selectively allowing or preventing air in the air-cooling duct from entering the main evaporation-cooling duct through the auxiliary air supply structure according to an operation mode of the heat pump unit" includes: and when the heat pump unit is determined to refrigerate, the auxiliary air supply structure prevents air in the air cooling air channel from entering the evaporation cooling main air channel.

In a preferable embodiment of the above air supply method of the present invention, "selectively allowing or preventing air in the air-cooling duct from entering the main evaporation-cooling duct through the auxiliary air supply structure according to an operation mode of the heat pump unit" includes: and when the heat pump unit is determined to heat, allowing air in the air cooling air channel to enter the evaporation cooling main air channel through the auxiliary air supply structure.

It should be noted that the heat pump unit of the present invention has all the technical effects of the outdoor unit. Similarly, the air supply method of the heat pump unit of the present invention also has all the technical effects of the outdoor unit, and those skilled in the art can obtain the air supply method without doubt according to the foregoing description, so that the details are not repeated herein.

Drawings

FIG. 1 is a block diagram schematically illustrating the construction of a heat pump unit according to an embodiment of the present invention;

FIG. 2 is a schematic view of an outdoor unit of a heat pump unit according to an embodiment of the present invention;

fig. 3 is a schematic front sectional view of the outdoor unit of fig. 2;

FIG. 4 is a schematic side view of the outdoor unit of FIG. 2 with the upper front panel hidden;

fig. 5 is a side sectional view of the outdoor unit of fig. 2;

fig. 6 is a schematic top view illustrating an internal structure of the outdoor unit of fig. 2;

fig. 7a to 7c are a front view, a left side and a right side of the evaporative cooling heat exchanger with the outer front panel hidden;

FIG. 8 is a flow chart of the main steps of the air supply method of the heat pump unit of the present invention;

FIG. 9 is a flow chart illustrating the detailed steps of the air blowing method of the heat pump unit according to the present invention.

Wherein, the one-to-one correspondence between component names and reference numbers in fig. 1 to 7c is:

a heat pump unit:

the system comprises a PS compressor, a Hi indoor unit, an EXV electronic expansion valve, a 4V four-way reversing valve, a first port e, a second port s, a third port d, a fourth port V, a GP1 first gas pipeline, a GP2 second gas pipeline, an LP1 first liquid pipeline, an LP2 second liquid pipeline, a BP bypass branch, a BP1 bypass switch valve and a BP2 capillary tube;

an outdoor unit:

1a air cooling air channel, 2a evaporation cooling main air channel and 3a evaporation cooling continuous air channel;

1, an outer shell: 10 outer bottom plate, 11 outer top plate, 12 upper front panel, 120 air cooling air inlet, 121 outer evaporation cooling air inlet, 13 lower left front panel, 14 lower right front panel, 15 outer rear panel, 16 outer left side plate, 17 outer right side plate and 18 partition plate;

2, inner case: 20 inner bottom plates, 21 inner top plates, 22 inner front panels, 220 inner evaporation cold air inlets, 221 auxiliary air inlets, 23 inner rear panels, 24 inner left side plates, 25 inner right side plates and 26 water collecting tanks;

3, a blast pipe;

4, air-cooled heat exchanger;

5, evaporating a cold heat exchanger: 50 heat exchanger bodies, 51 spray water pipes and 52 nozzles;

6 a fan.

Detailed Description

Preferred embodiments of the present invention are described below with reference to the accompanying drawings. It should be understood by those skilled in the art that these embodiments are only for explaining the technical principle of the present invention, and are not intended to limit the scope of the present invention.

For convenience of understanding and brevity of description, the following description is provided with reference to a heat pump unit and an outdoor unit thereof, and the beneficial effects will not be repeated.

In the present specification, the terms "top, bottom, front, rear, left, and right" used in describing the structure of the outdoor unit are set at the user angle when the outdoor unit is in use, and are top at the top of the user, bottom at the bottom of the user, front toward the user, rear away from the user, left at the left-hand side of the user, and right at the right-hand side of the user.

Referring to fig. 1 to 7c, fig. 1 is a schematic structural diagram of an embodiment of a heat pump unit of the present invention, fig. 2 is a schematic front view structural diagram of an outdoor unit of the heat pump unit of the present invention, fig. 3 is a schematic front sectional structural diagram of the outdoor unit of fig. 2, fig. 4 is a schematic axial structural diagram of the outdoor unit of fig. 2 with an upper front outer panel hidden, fig. 5 is a schematic side sectional structural diagram of the outdoor unit of fig. 2, fig. 6 is a schematic top view internal structural diagram of the outdoor unit of fig. 2, and fig. 7a to 7c are a schematic front view structural diagram, a schematic left side structural diagram and a schematic right side structural diagram of an evaporation heat exchanger with an outer front outer panel hidden. Solid arrows in fig. 1 represent the flow direction of the refrigerant when the heat pump unit performs cooling, dotted arrows represent the flow direction of the refrigerant when the heat pump unit performs heating, and solid arrows in fig. 2 to 6 represent the flow direction of the air flow.

Referring to fig. 1, the heat pump unit at least comprises a compressor PS, an outdoor heat exchanger Ho, an indoor heat exchanger Hi, an electronic expansion valve EXV and a four-way reversing valve 4V, and the compressor PS, the outdoor heat exchanger Ho, the electronic expansion valve EXV, the indoor heat exchanger Hi and the four-way reversing valve 4V are communicated with each other through pipelines to form a refrigerant circulation loop for refrigerant to circularly flow. The four-way reversing valve 4V is used for adjusting the flow direction of the refrigerant in the refrigerant circulation loop so as to adjust the refrigeration or heating of the air conditioner.

In detail, the four-way selector valve 4V has a first port e, a second port s, a third port d and a fourth port V, wherein the first port e communicates with the discharge port of the compressor PS through a gas line, the second port s communicates with one port of the indoor heat exchanger Hi through a first gas line GP1, the third port d communicates with one port of the outdoor heat exchanger Ho through a second gas line GP2, the fourth port V communicates with the suction port of the compressor PS, the other port of the outdoor heat exchanger Ho communicates with one port of the electronic expansion valve EXV through a first liquid line LP1, and the other port of the indoor heat exchanger Hi and the other port of the electronic expansion valve EXV communicate through a second liquid line LP 2.

When the heat pump unit is used for refrigerating, the first port e and the third port d of the four-way reversing valve 4V are communicated, the second port s and the fourth port V are communicated, high-temperature and high-pressure gaseous refrigerant in the compressor PS flows in a refrigerant circulation loop in a circulating mode, is subjected to heat exchange with outdoor air to release heat and condense when flowing through the outdoor heat exchanger Ho to form liquid refrigerant, flows into the indoor heat exchanger Hi after being throttled by the electronic expansion valve EXV, is subjected to heat exchange with the indoor air to absorb heat and evaporate into gaseous refrigerant, and finally returns to the compressor PS, and the indoor air releases heat and cools during the period to achieve the purpose of refrigerating.

When the heat pump unit heats, the first port e and the second port s of the four-way reversing valve 4V are communicated, the third port d and the fourth port V are communicated, high-temperature and high-pressure gaseous refrigerant in the compressor PS flows in a refrigerant circulation loop in a circulating mode, and forms liquid refrigerant after being subjected to heat exchange, heat release and condensation with indoor air when flowing through the indoor heat exchanger Hi, flows into the outdoor heat exchanger Ho after being throttled by the electronic expansion valve EXV, is subjected to heat exchange, heat absorption and evaporation with outdoor air to form gaseous refrigerant, and finally returns to the compressor PS, and the purpose of heating is achieved by heat absorption and temperature rise of the indoor air during the period.

The heat pump unit further comprises a bypass branch BP, wherein the bypass branch BP bypasses a suction port of the compressor PS and the first liquid pipeline LP1, and comprises a capillary tube BP2 and a bypass switch valve BP 1.

Whether refrigeration or heating is carried out, the bypass switch valve BP1 is opened firstly in a period of time before the compressor PS is started, so that the exhaust port and the suction port of the compressor PS are basically and directly communicated with the high pressure and the low pressure of the system, the compressor PS of the heat pump unit can be started after the absolute value of the system high pressure at the exhaust port of the compressor PS and the system low pressure difference at the suction port of the compressor PS reach the starting pressure threshold value, thus the conditions of the balance between the temperature of lubricating oil and the high pressure and the low pressure of the system can be strictly met, the situation that the compressor PS is damaged due to liquid compression or the compressor PS cannot be started due to overlarge high-low pressure difference is basically avoided, and the problem that the refrigerant dissolved in an oil pool of the compressor PS.

In this embodiment, the outdoor heat exchanger, the compressor, the four-way reversing valve, and the pipelines on the other refrigerant circulation circuits are all disposed in one casing and collectively referred to as an outdoor unit.

Referring to fig. 2 to 6, in the present embodiment, the outdoor unit of the heat pump unit includes an air-cooling air duct 1a, a main evaporation-cooling air duct 2a, an evaporation-cooling communication air duct 3a, and an auxiliary air supply structure. The air cooling air duct 1a surrounds the main evaporative cooling air duct 2a, the evaporative cooling communicating air duct 3a penetrates through the air cooling air duct 1a and is communicated with the main evaporative cooling air duct 2a, the evaporative cooling communicating air duct 3a is used for guiding outdoor air into the main evaporative cooling air duct 2a, the auxiliary air supply structure is arranged between the air cooling air duct 1a and the main evaporative cooling air duct 2a, the auxiliary air supply structure is used for guiding outdoor air into the main evaporative cooling air duct 2a, the auxiliary air supply structure is used for allowing or preventing air in the air cooling air duct 1a from entering the main evaporative cooling air duct 2a, the air cooling heat exchanger 4 is arranged in the air cooling air duct 1a, and the evaporative cooling heat exchanger 5 is arranged in the main evaporative cooling air duct 2 a.

In detail, the outdoor unit further includes an outer casing 1, an inner casing 2, and a blast pipe 3.

The outer casing 1 is a cube shell surrounded by an outer bottom plate 10, an outer top plate 11, an outer front panel, an outer rear panel 15, an outer left side plate 16 and an outer right side plate 17. The outer casing 1 further comprises a partition plate 18, the partition plate 18 divides the outer casing 1 into an upper chamber and a lower chamber, based on the upper chamber and the lower chamber formed after the partition, the outer front panel comprises an upper front panel 12, a lower left front panel 13 and a lower right front panel 14, the upper front panel 12 is used for shielding a front opening of the upper chamber, and the lower left front panel 13 and the lower right front panel 14 are spliced to shield a front opening of the lower chamber.

The inner casing 2 is located in the upper chamber and is fixedly arranged on the partition plate 18 by means of screwing, riveting, welding or bonding and the like. The upper front panel 12, the outer rear panel 15, the left side panel and the right side panel of the outer casing 1 are all provided with air-cooled air inlets 120, the outer top plate 11 is provided with a main air outlet, a space formed by the outer casing 1 and the inner casing 2 in a surrounding manner is communicated with the air-cooled air inlets 120 and the main air outlet to form an air-cooled air duct 1a of the outdoor unit, and an air-cooled heat exchanger 4 is arranged in the air-cooled air duct 1 a.

Referring to fig. 6, in this embodiment, the outdoor unit includes two air-cooled heat exchangers 4, each of the air-cooled heat exchangers 4 is of a bent structure, openings of the bent structure are oppositely disposed to surround the inner casing 2, and preferably, in this embodiment, the air-cooled heat exchanger 4 is bent into an L-shaped structure. Of course, the air-cooled heat exchanger 4 arranged in the air-cooled air duct 1a can meet the requirements of the functions of the surrounding inner casing 2 and the processing and assembling processes, and the air-cooled heat exchanger 4 is bent into a U-shaped structure or a V-shaped structure. The number of the air-cooled heat exchangers 4 is not limited to two, and may be, for example, four air-cooled heat exchangers 4 having an L-shaped structure. In addition, the outdoor unit can also be provided with four plate heat exchangers, and the four heat exchangers surround to form a square structure to surround the inner casing 2.

It is conceivable that a plurality of air-cooled heat exchangers 4 surround the inner casing 2, and air-cooled air inlets 120 are formed in the upper front panel 12, the outer rear panel 15, the left side panel and the right side panel of the outer casing 1, so as to satisfy the requirement of sufficient heat exchange of outdoor air and refrigerant in the air-cooled heat exchangers 4, and to make the air-cooled heat exchangers 4 have better heat exchange efficiency. In addition, in order to ensure that the air-cooled heat exchanger 4 and the outdoor air are in full contact, a plurality of air-cooled air inlets 120 are formed in the outer casing 1, and the air-cooled air inlets 120 are arranged in a square array so as to be convenient for the windward shapes of the air-cooled heat exchanger 4 to be matched.

Of course, on the basis that the amount of air entering the air-cooled air duct 1a from the inside to the outside meets the heat exchange requirement of the cooling medium in the air-cooled heat exchanger 4 and the requirements of the processing and assembling processes, a person skilled in the art can adjust the number, the arrangement position and the specific structure of the air-cooled air inlets 120 according to actual needs.

Referring to fig. 7a to 7c, the inner casing 2 is a rectangular parallelepiped housing surrounded by an inner bottom plate 20, an inner top plate 21, an inner front plate 22, an inner rear plate 23, an inner left side plate 24, and an inner right side plate 25. The inner front panel 22 of the inner casing 2 is provided with an inner evaporation cold air inlet 220 and an evaporation cold air inlet 121, the inner top panel 21 is provided with an evaporation cold air outlet, the inner casing 2 can also be an open-top cuboid shell which is only surrounded by an inner bottom panel 20, an inner front panel 22, an inner rear panel 23, an inner left side panel 24 and an inner right side panel 25, and the top opening of the cuboid shell serves as the evaporation cold air outlet.

An outer evaporation cold air inlet 121 is further formed in the front panel 12 on the upper portion of the outer casing 1, the air supply pipe 3 is fixedly connected with the inner casing 2 and the outer casing 1 in a welding mode, a screw connection mode, a riveting mode or a bonding mode and the like, and is communicated with the outer evaporation cold air inlet 121 and the inner evaporation cold air inlet 220 to form an evaporation cold communication air channel 3 a.

The inner casing 2 is communicated with the inner evaporation cold air inlet 220, the evaporation cold air inlet 121 and the evaporation cold air outlet to form an evaporation cold main air duct 2 a. The evaporation cold communicating air duct 3a can guide the outdoor air into the evaporation cold main air duct 2a under the action of the fan 6 of the outdoor unit, that is, under the action of the fan 6 of the outdoor unit, the outdoor air enters the air supply pipe 3 from the external evaporation cold air inlet 121, then enters the inner casing 2 through the evaporation cold air inlet 121 of the internal evaporation cold air inlet 220, then enters the upper part of the outer casing 1 from the evaporation cold air outlet, and finally is discharged into the outdoor environment outside the outer casing 1 from the main air inlet of the outer casing 1.

With continued reference to fig. 7a to 7c, an evaporative cooling heat exchanger 5 is disposed in the inner casing 2, the evaporative cooling heat exchanger 5 includes a heat exchanger body 50 and a shower mechanism including a shower pipe 51 and a plurality of nozzles 52 or shower heads disposed on the shower pipe 51 and communicating with the shower pipe 51, the shower pipe 51 is located above the heat exchanger body 50 so that water in the shower pipe 51 is sprayed from the nozzles 52 or shower heads onto the heat exchanger body 50.

The spraying mechanism further comprises a water tank and a water pump, the water tank and the water pump are installed in the lower cavity of the outer shell 1, and the water tank and the water pump are communicated through a water pipe. The spray water pipe 51 penetrates through the inner casing 2, extends into the air cooling air duct 1a, penetrates through the partition plate 18, extends into the lower cavity of the outer casing 1, and then is communicated with the water pump. When the spraying mechanism works, the water pump is started, cooling water in the water tank is pumped into the spraying water pipe 51, and finally sprayed onto the heat exchanger body 50 from the nozzle 52 or the spray head to exchange heat with the internal cooling medium, and after the cooling water after heat exchange absorbs heat and is evaporated into vapor, the vapor is discharged out of the outdoor unit from the main air outlet of the outer casing 1 under the action of the fan 6. The other part is sunk into a water collecting tank 26, the water collecting tank 26 is formed by the inner bottom plate 20, the inner front panel 22, the inner rear panel 23, the inner left side plate 24 and the inner right side plate 25 in a surrounding mode, and cooling water in the water collecting tank 26 can be directly discharged out of the outer machine shell 1 through a drainage mechanism or is communicated with the water tank through a recycling water pipe and recycled to the water tank for recycling.

The heat exchanger body 50 may be a plate heat exchanger, a heat pipe heat exchanger, or a fin heat exchanger.

With continued reference to fig. 7a to 7c, as mentioned above, the outdoor unit further includes an auxiliary air supply structure for allowing or preventing air in the air-cooled duct 1a from entering the main evaporative cooling duct 2 a.

The auxiliary air supply structure includes an auxiliary air inlet 221, a wind screen, and a driving element. The auxiliary air inlet 221 is formed in the inner housing 2, the auxiliary air inlet 221 is formed in each of the inner rear panel 23, the inner left side panel 24 and the inner right side panel 25 of the inner housing 2, the wind shield is movably disposed at the auxiliary air inlet 221, and the driving element is used for driving the wind shield to move to open or close the auxiliary air inlet 221.

In more detail, the shape and size of the wind deflector are matched with the auxiliary air inlet 221, so that the auxiliary air inlet 221 can be closed. The wind screen is characterized in that a rotating shaft is arranged on one edge of the wind screen, a rotating shaft seat is arranged on the inner casing 2, the wind screen is rotatably arranged in the rotating shaft seat through the rotating shaft, the driving element is specifically a motor, the casing of the motor is fixedly arranged on the inner casing 2, the armature shaft and the rotating shaft of the motor are fixedly connected through a coupler, the armature shaft drives the rotating shaft of the wind screen to rotate after the motor is started, and the wind screen rotates along with the rotating shaft of the wind screen. The opening of the auxiliary air inlet 221 can be adjusted by adjusting the rotation speed and rotation angle of the motor, and then the air quantity entering the main evaporation cooling air duct 2a from the air cooling air duct 1a can be adjusted.

When the heat pump unit is used for refrigerating, the spraying mechanism of the evaporative cooling heat exchanger 5 works to spray cooling water onto the heat exchanger body 50 of the evaporative cooling heat exchanger 5, the auxiliary air supply structure prevents air in the air cooling air channel 1a from entering the evaporative cooling main air channel 2a, the outdoor unit plays a role of a condenser at the moment, and high-temperature and high-pressure gaseous refrigerants in the compressor flow into the air cooling heat exchanger 4 and the evaporative cooling heat exchanger 5. Meanwhile, under the action of the fan 6 of the outdoor unit, part of the outdoor air enters the air-cooling air duct 1a, absorbs heat through heat exchange with the refrigerant in the air-cooling heat exchanger 4, is heated and then is discharged out of the outdoor unit, and part of the outdoor air enters the main evaporative cooling air duct 2a from the evaporative cooling communicating air duct 3a, exchanges heat with the refrigerant in the cooling water and evaporative cooling heat exchanger 5, absorbs the heated and then carries part of the vapor to be discharged out of the outdoor unit.

When the heat pump unit heats, the spraying mechanism of the evaporative cooling heat exchanger 5 does not work, the evaporative cooling heat exchanger 5 only exchanges heat with outdoor air, the auxiliary air supply structure operates to allow air in the air cooling air channel 1a to enter the evaporative cooling main air channel 2a, the outdoor unit plays a role of an evaporator at the moment, and a refrigerant is condensed in the indoor unit, throttled and depressurized by the electronic expansion valve and then enters the outdoor unit. Under the action of the outdoor unit fan 6, part of outdoor air enters the air cooling air channel 1a, is discharged out of the outdoor unit after being subjected to heat exchange, heat release and condensation with the refrigerant in the air cooling heat exchanger 4, and the other part of the outdoor air enters the main evaporative cooling air channel 2a from the auxiliary air supply structure, and is subjected to heat exchange, heat release and condensation with the refrigerant in the main evaporative cooling air channel 2a after being converged with the air entering the main evaporative cooling air channel 2a from the evaporative cooling communication air channel 3a, and finally is discharged out of the outdoor unit.

As described in the background art, the air-cooled heat exchanger and the evaporative cooling heat exchanger of the conventional outdoor unit share one air duct, and the outdoor air enters the air duct, exchanges heat with the air-cooled heat exchanger, and then exchanges heat with the evaporative cooling heat exchanger. When the heat pump unit heats, the spraying mechanism of the evaporation cold heat exchanger does not work, a refrigerant in the evaporation cold heat exchanger only exchanges heat with the air heat exchanger, and partial outdoor air is directly discharged out of the outdoor unit after the heat exchange of the air cold heat exchanger and does not participate in the heat exchange of the evaporation cold heat exchanger, so that the air quantity entering the evaporation cold heat exchanger is less, and the heating efficiency is low. In addition, when the heat pump unit is used for refrigerating, the spraying mechanism of the evaporative cooling heat exchanger works, outdoor air firstly exchanges heat with the air-cooled heat exchanger to absorb heat and raise temperature and then enters the evaporative cooling heat exchanger, so that the temperature difference between a refrigerant in the evaporative cooling heat exchanger and the outdoor air exchanged with the refrigerant is small, and the problem of low refrigerating efficiency of the evaporative cooling heat exchanger can be caused.

Therefore, the air-cooled heat exchanger 4 and the evaporative cooling heat exchanger 5 of the outdoor unit of the invention are arranged in two mutually independent air channels, and the air in the air channel in which the air-cooled heat exchanger 4 is arranged is allowed or prevented to flow to the air channel in which the evaporative cooling heat exchanger 5 is arranged by an auxiliary air supply structure.

When the heat pump unit refrigerates, the auxiliary air supply structure prevents air in the air cooling air channel 1a where the air cooling heat exchanger 4 is located from flowing to the main evaporation cooling air channel 2a where the evaporation cooling heat exchanger 5 is located, at the moment, the two air channels are completely isolated, and independent air supply is provided for the air cooling heat exchanger 4 and the evaporation cooling heat exchanger 5, so that outdoor air enters the main evaporation cooling air channel 2a at a higher air speed, a larger temperature difference between the outdoor air and a refrigerant is ensured, the heat exchange effect of the evaporation cooling heat exchanger 5 is improved, and the condensation effect is better.

When the heat pump unit heats, the auxiliary air supply structure allows air in the air channel where the air-cooled heat exchanger 4 is located to flow to the air channel where the evaporative cooling heat exchanger 5 is located, the evaporative cooling main air channel 2a is internally provided with outdoor air led in from the evaporative cooling communicating air channel 3a and outdoor air led in from the air-cooled air channel 1a, the air quantity entering the evaporative cooling main air channel 2a is increased, the heat exchange effect of the evaporative cooling heat exchanger 5 is improved, and the heating capacity of the evaporative cooling heat exchanger is improved.

In addition, the auxiliary blower 6 of the outdoor unit can also be manually implemented, for example, the auxiliary blower 6 includes at least one auxiliary air inlet 221 formed on the inner casing 2, and a wind shield detachably connected to the inner casing 2 for opening or closing the auxiliary air inlet 221, the wind shield can be detachably connected to the inner casing 2 by screws, and can also be detachably connected to the inner casing 2 by matching hooks and bayonets. During refrigeration, a user can disassemble the wind shield by himself and open the auxiliary air inlet 221 to allow air in the air-cooling air duct 1a to enter the evaporation cooling air duct; when heating, the user connects the wind shield to the inner casing 2, and closes the auxiliary air inlet 221 to prevent the air in the air-cooling air channel 1a from entering the evaporation cooling air channel.

In addition, the present invention also provides an air blowing method applied to the heat pump unit, the main steps of the air blowing method will be described in detail below with reference to fig. 8, and fig. 8 is a flow chart of the main steps of the air blowing method of the heat pump unit of the present invention.

The air supply method mainly comprises the following steps:

s1, determining the working mode of the heat pump unit; the working modes comprise cooling and heating.

The method for determining the working mode is mainly determined according to a control instruction sent by a user through a remote controller, for example, when the user presses a cooling button on the remote controller, the controller can obtain the instruction and determine that the working mode desired by the user is cooling, and similarly, when the user presses a heating button on the remote controller, the controller determines that the working mode of the controller is heating. Of course, the heat pump unit of the present invention may also automatically determine the working mode that it should execute, for example, compare the magnitude relation between the indoor temperature and the most suitable set temperature sensed by the user, and determine that the heating mode should be started when the indoor temperature is less than the set temperature; on the contrary, when the indoor temperature is higher than the set temperature, the refrigeration mode is determined to be started, and when the back four-way reversing valve is determined to adjust the refrigerant flow direction: when refrigerating or defrosting, the exhaust port of the compressor is communicated with the outdoor heat exchanger through the four-way reversing valve, and the air suction port of the compressor is communicated with the indoor heat exchanger through the four-way reversing valve; when heating, the exhaust port of the compressor is communicated with the indoor heat exchanger through the four-way reversing valve, and the air suction port of the compressor is communicated with the outdoor heat exchanger through the four-way reversing valve.

And S2, selectively allowing or preventing the air in the air-cooled air duct 1a from entering the main evaporative cooling air duct 2a through the auxiliary air supply structure according to the working mode.

For convenience of understanding, the air blowing method of the present invention is described in detail below by referring to fig. 9, which is an example of the heat pump unit, and fig. 9 is a detailed step flow diagram of the air blowing method of the heat pump unit of the present invention.

In detail, referring to fig. 9, when the operation mode of the heat pump unit is determined to be cooling in step S1, step S2 includes the steps of:

and S20, the auxiliary air supply structure prevents air in the air cooling air channel 1a from entering the evaporation cold air channel.

That is, the starting motor drives the wind shield to rotate relative to the inner housing 2 to close the auxiliary air inlet 221, and the air cooling duct 1a and the evaporation cooling duct supply air independently.

When the step S1 determines that the operation mode of the heat pump unit is heating, the step S2 includes the following steps:

and S21, the auxiliary air supply structure allows air in the air cooling air channel 1a to enter the evaporation cold air channel.

That is to say, the starting motor drives the wind shield to rotate relative to the inner casing 2 to open the auxiliary air inlet 221, and under the action of the fan 6, air in the air-cooling air duct 1a enters the evaporative cooling main air duct 2a from the auxiliary air inlet 221 to participate in heat exchange with the refrigerant in the evaporative cooling heat exchanger 5.

When the heat pump unit refrigerates, the auxiliary air supply structure prevents air in the air cooling air channel 1a where the air cooling heat exchanger 4 is located from flowing to the main evaporation cooling air channel 2a where the evaporation cooling heat exchanger 5 is located, at the moment, the two air channels are completely isolated, and air is independently supplied to the air cooling heat exchanger 4 and the evaporation cooling heat exchanger 5, so that outdoor air enters the evaporation cooling air channel at a higher air speed, a larger temperature difference between the outdoor air and a refrigerant is ensured, the heat exchange effect of the evaporation cooling heat exchanger 5 is improved, and the condensation effect is better.

When the heat pump unit heats, the auxiliary air supply structure allows air in the air channel where the air-cooled heat exchanger 4 is located to flow to the air channel where the evaporative cooling heat exchanger 5 is located, the evaporative cooling main air channel 2a is internally provided with outdoor air led in from the evaporative cooling communicating air channel 3a and outdoor air led in from the air-cooled air channel 1a, the air volume entering the evaporative cooling air channel is increased, the heat exchange effect of the evaporative cooling heat exchanger 5 is improved, and the heating capacity of the evaporative cooling heat exchanger is improved.

With continued reference to fig. 9, after step S2, the air supply method of the present invention further includes:

s22, judging whether the absolute value of the system high-low pressure difference of the heat pump unit is smaller than or equal to the starting pressure threshold of the compressor of the heat pump unit.

If yes, go to step S3 to start the compressor;

otherwise, adjusting the system pressure of the heat pump unit until the absolute value of the high-low pressure difference of the system is smaller than or equal to the starting pressure threshold of the compressor.

The system high-low pressure difference is a difference between a high pressure at an exhaust port of the compressor and a low pressure at an air suction port thereof, and the system high-pressure and the system low-pressure are generally acquired by arranging pressure sensors at the exhaust port and the air suction port respectively. In addition, the starting pressure threshold of the compressor is a pressure value capable of ensuring normal starting of the compressor, and is set by a person skilled in the art according to the structure and power of the compressor.

Specifically, when the air supply method is implemented by using the heat pump unit, step S23 specifically includes: and opening the bypass switch valve until the absolute value of the high-low pressure difference of the system is less than or equal to the starting pressure threshold of the compressor of the heat pump unit, and then closing the bypass switch valve.

Whether refrigerating or heating, the bypass switch valve is opened firstly in a period of time before the compressor is started, so that the exhaust port and the suction port of the compressor are basically and directly conducted to adjust the high pressure and the low pressure of the system, after the absolute value of the system high pressure at the exhaust port of the compressor and the system low pressure difference at the suction port of the compressor reaches a starting pressure threshold value, the compressor of the heat pump unit can be started, thus the conditions of lubricating oil temperature and system high-low pressure balance can be strictly met, the situation that the refrigerant dissolved in a compressor oil sump boils and foams to bring the lubricating oil into a compression cavity to cause liquid compression to damage the compressor, or the situation that the compressor cannot be started due to overlarge high-low pressure difference is basically avoided.

So far, the technical solutions of the present invention have been described in connection with the preferred embodiments shown in the drawings, but it is easily understood by those skilled in the art that the scope of the present invention is obviously not limited to these specific embodiments. Equivalent changes or substitutions of related technical features can be made by those skilled in the art without departing from the principle of the invention, and the technical scheme after the changes or substitutions can fall into the protection scope of the invention.